MIC2590B-5BTQ Micrel Inc, MIC2590B-5BTQ Datasheet - Page 4

• Manufacturer Part Number: MIC2590B-5BTQ
• Description: IC PCI HOT PLUG CTLR DUAL 48TQFP
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2590B-5BTQ

• Applications: PCI, PCI-X
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 5V, ±12V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Micrel, Inc.
September 2008
Pin Number
45, 42
16, 21
13, 24
14, 23
11, 26
15, 22
44, 43
9, 28
7, 30
8, 29
33
5VSENSEA, 5VSENSEB
3VSENSEA, 3VSENSEB
5VGATEA, 5VGATEB
3VGATEA, 3VGATEB
AUXENA, AUXENB
3VOUTA, 3VOUTB
5VOUTA, 5VOUTB
VAUXA, VAUXB
VSTBY – 2 pins
ONA, ONB
Pin Name
IREF
Pin Function
AUX Enable Inputs [A/B]: Rising-edge sensitive enable inputs for VAUXA and
VAUXB outputs. Taking AUXENA/AUXENB low after a fault resets the
respective slot’s Aux Output Fault Latch. Tie these pins to ground if using
SMBus-mode power control.
3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs. Used to monitor
the 3.3V output voltages for Power-Good status.
5V Power-Good Sense Inputs: Connect to 5V[A/B] outputs. Used to monitor the
5V output voltages for Power-Good status.
A resistor connected between this pin and ground sets the ADC current
measurement gain. This resistor must be 20kΩ ±1%.
5V Circuit Breaker Sense Input [A/B]: The current-limit thresholds are set by
connecting sense resistors between these pins and 5VIN[A/B]. When the
current-limit threshold of IR = 50mV is reached, the 5VGATE[A/B] pin is
modulated to maintain a constant voltage across the sense resistor and
therefore a constant current into the load. If the 50mV threshold is exceeded for
t
immediately pulled low.
3V Circuit Breaker Sense Input [A/B]: The current limit thresholds are set by
connecting sense resistors between these pins and 3VIN[A/B]. When the
current limit threshold of IR = 50mV is reached, the 3VGATE[A/B] pin is
modulated to maintain a constant voltage across the sense resistor and
therefore a constant current into the load. If the 50mV threshold is exceeded for
t
immediately pulled low.
5V Gate Drive Outputs [A/B]: Each connects to the gate of an external N-
Channel MOSFET. During power-up the C
are charged by a 20µA current source. This controls the value ofdv/dt seen at
the source of the MOSFETs, and hence the current flowing into the load
capacitance.
During current limit events, the voltage at this pin is adjusted to maintain
constant current through the switch for a period of t
overcurrent, thermal shutdown or input undervoltage fault condition occur sthe
GATE pin for the affected slot is immediately brought low.
During power-down these pins are discharged by an internal current source.
3V Gate Drive Outputs [A/B]: Each connects to the gate of an external N-
Channel MOSFET. During power-up the C
are charged by a 20µA current source. This controls the value ofdv/dt seen at
the source of the MOSFETs, and hence the current flowing into the load
capacitance.
During current limit events, the voltage at this pin is adjusted to maintain
constant current through the switch for a period of t
overcurrent, thermal shutdown or input undervoltage fault condition occurs the
GATE pin for the affected slot is immediately brought low.
During power-down these pins are discharged by an internal current source.
3.3V Standby input voltage required to support PCI 2.2 VAUX input: SMBus,
internal registers and A/D converter run off of VSTBY to ensure chip access
during standby modes. A UVLO circuit prevents turn-on of this supply until
VSTBY rises above its UVLO threshold. Both pins must be tied together at the
chip.
V
pin of the PCI 2. 2 Connectors VSTBY via internal 400mΩ MOSFETs which are
current-limited and protected against short circuit faults.
Enable input for MAIN outputs: Rising-edge sensitive. Used to enable or
disable MAIN (5V, 3.3V, +12V, –12V) outputs. Taking ONA/ONB low after a
fault resets the respective slot’s Main Output Fault Latch. Tie these pins to
ground if using SMBus-mode power control.
FLT
FLT
AUX
, the circuit breaker is tripped and the GATE pin for the affected slot is
, the circuit breaker is tripped and the GATE pin for the affected slot is
[A/B] output voltages to PCI card slots: These outputs connect the VAUX
4
GATE
GATE
and the gate of the MOSFETs
and the gate of the MOSFETs
FLT
FLT
. Whenever an
. Whenever an
M9999-091808
MIC2590B